P1663
Fuel Demand Command Signal Circuit Malfunction
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Power Loss
- The engine stalls
- Check Engine light comes on
Causes
- Open or short circuit in the fuel supply command signal circuit
- Fuel sensor malfunction
- Problems with the engine control unit (ECU)
- Bad contacts in connectors
- Wiring corrosion
How to Fix
- Check the integrity of wiring and connectors
- Check the operation of the fuel sensor
- Check the condition of the engine control unit (ECU)
- Replace damaged components
- Clean contacts from corrosion